add CVE-2020-35729

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# Klog Server Unauth RCE(CVE-2020-35729)
The 'authenticate.php' file uses the 'user' HTTP POST parameter in a call to the 'shell_exec()' PHP function without appropriate input validation,allowing arbitrary command execution as the apache user.
**Affected Version**: ≤2.4.1
**FOFA query rule**: [title="KLog Server" && body="authenticate.php"](https://fofa.so/result?qbase64=dGl0bGU9IktMb2cgU2VydmVyIiYmYm9keT0iYXV0aGVudGljYXRlLnBocCI%3D)
# Demo
![](CVE_2020_35729.gif)